Gbindina-stteeace in mills



C. ROSS.

Millstone Dress. No. 11,311. Patented Oct. 17, 185% UNITED STATES PATENT oEEIoE.

CHARLES ROSS, OF ROCHESTER, NEW YORK.

GRINDING-SURFACE IN MILLS.

Specification of Letters Patent No. 11,811, dated October 17, 1854.

To all whom it may concern:

Be it known that I, CHARLES Ross, of the city of Rochester, in the county of Monroe and State of New York, have invented a new and usefulMode of Forming a Grinding Surface in Mills; and do hereby declare that the following is a full and exactdescription of the construction of the same, reference being had to the annexed drawings, making part of this specification, of which Figure 1 is a perspective view of the cast iron case or shell representing also the interior flanges thereto, a1, :0, and a. Fig. 2 is also a perspective drawing of the case or shell aforesaid, representing a partial interior view of the contiguous segments composing the lining thereof, and Fig. 3 a sectional interior view of the contiguous segments composing said lining.

In forming the concave or external grinder, I make use of an external case or shell of cast iron or other metal of the shape of a truncated cone, or of a cylindrical shape (if preferred), said case, or shell having at the upper and lower ed e thereof, a flange projecting inward from the internal surface of the case or shell, say from half an inch or more in depth, as may be desirable, represented by m, as, and .2 in Figs. 1, 2 and 3, the flanges 02, m," at the base of said case or shell having a piece a, of sufficient size stopped thereout, as shall allow of the adjustment of a key-stone in the concave lining as hereinafter named. I then form a suflic'ient number of segments of burr stone, or of other stone or similar material of proper shape, length and size, and so adjust them with accuracy to each other, and also to the said flanges and interior surface of said shell or concave, so as that they shall form a complete, firm, compact and even lining thereto, as represented by a, b, 0, d,

in Figs. 2 and 3, hereto annexed, m, w, and z, in each figure representing the interior flanges of the concave respectively, which secure the ends of said segments snugly to their proper places.

In forming, placing and securing said segments composing the aforesaid lining, I am very particular to have the last segment as represented by a in Figs. 2 and 3, of such size and shape, as when forced into its proper place, shall, on the principle of the keystone in an arch, securely and tightly bind each and all of the aforesaid segments composing the concave lining, to their proper and respective places, a piece having been stopped out of the lower or base flange a, in Fig. 1, of suflicie-nt size to admit through it, the passage of said keystone or dovetail. I bed each of the aforesaid segments in cement or other similar and proper material, which when it becomes set or hardened, adds much to the security of said lining. material used for bedding the segments shall have become sufliciently hard, I then score down with a sharp Steel pick or point the interior concave surface of said lining, so as to conform so near as possible to the corresponding surface of the core runner that is intended to revolve within said concave, which correspondence of the concave and convex grinding surfaces is more accurately effected by grinding the stone together, by. the use of sand and water, or either of them separatel after which grinding-in process, the grinding surfaces, both of the said concave and convex surfaces are prepared to secure the proper furrows andcrash.

Y, Y, in Figs. 1 and 2, represent the ears forming a part of the said case or shell casting, by which the concave or shell is to be secured by screw-bolts to a mill frame composed of iron or Wood.

What I claim and desire to secure by Letters Patent is the forming of a grinding sur face in mills by lining a cast iron concave with radial segments of burr or other stone, said segments being fitted and secured to their places in the manner herein set forth.

CHARLES RUSS.

After the cement or other SlIHllZLI 

